Power column



FIG. 1 is a three-quarter perspective veiw of a power column in accordance with a first embodiment of our Design;

FIG. 2 is an elevational view of the face of the column that appears at the left in FIG. 1; the elevational view of the opposite face of the column is the same;

FIG. 3 is an elevational view of the face of the column that appears in the right in FIG. 1; the elevational view of the opposite face of the column is the same;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view;

FIG. 6 is enlarged version of FIG. 4;

FIG. 7 is an enlarged version of FIG. 5;

FIG. 8 is an enlarged version of the extreme top and bottom sections of FIG. 1;

FIG. 9 is an enlarged version of the extreme top and bottom sections of FIG. 2; and,

FIG. 10 is an enlarged version of the extreme top and bottom sections of FIG. 3.

The broken lines in certain of the views indicate indefinite length. 

The ornamental Design for a power column, as shown and described. 